>> I have the automatic function enabled. I go to an ancestor and see
>> he/she
>> is indeed a xxx type of relation to my target person (me). I then click
>> on a Son-Bio/Daughter-Bio event tag for that person, then close the tag
>> entry window, and the relationship is gone. The person is not shown as
>> not being related to the target person. Also it seems to only affect the
>> parent being displayed. The other parent still shows the relationship.
>
> I see what you see. It happens when you close the relationship tag with
> [OK]
> but does not happen when you [Cancel] the tag. It also does not happen
> with
> every ancestor. Reported the issue.
>
> This could be by design but don't see why a relationship out of the line
> would have this effect.

After playing with this further, I'm assuming that this is by design.
Basically, when any relationship tag linked to a person is saved, the
automatic relation tag for that person is reset until you recalculate all
relationships.